<?php
//dezend by http://www.yunlu99.com/ QQ:270656184
defined('BASEPATH') || exit('No direct script access allowed');
class CI_DB_pdo_4d_forge extends CI_DB_pdo_forge
{
	/**
	 * CREATE DATABASE statement
	 *
	 * @var	string
	 */
	protected $_create_database = 'CREATE SCHEMA %s';
	/**
	 * DROP DATABASE statement
	 *
	 * @var	string
	 */
	protected $_drop_database = 'DROP SCHEMA %s';
	/**
	 * CREATE TABLE IF statement
	 *
	 * @var	string
	 */
	protected $_create_table_if = 'CREATE TABLE IF NOT EXISTS';
	/**
	 * RENAME TABLE statement
	 *
	 * @var	string
	 */
	protected $_rename_table = false;
	/**
	 * DROP TABLE IF statement
	 *
	 * @var	string
	 */
	protected $_drop_table_if = 'DROP TABLE IF EXISTS';
	/**
	 * UNSIGNED support
	 *
	 * @var	array
	 */
	protected $_unsigned = array('INT16' => 'INT', 'SMALLINT' => 'INT', 'INT' => 'INT64', 'INT32' => 'INT64');
	/**
	 * DEFAULT value representation in CREATE/ALTER TABLE statements
	 *
	 * @var	string
	 */
	protected $_default = false;

	protected function _alter_table($alter_type, $table, $field)
	{
		if (in_array($alter_type, array('ADD', 'DROP'), true)) {
			return parent::_alter_table($alter_type, $table, $field);
		}

		return false;
	}

	protected function _process_column($field)
	{
		return $this->db->escape_identifiers($field['name']) . ' ' . $field['type'] . $field['length'] . $field['null'] . $field['unique'] . $field['auto_increment'];
	}

	protected function _attr_type(&$attributes)
	{
		switch (strtoupper($attributes['TYPE'])) {
		case 'TINYINT':
			$attributes['TYPE'] = 'SMALLINT';
			$attributes['UNSIGNED'] = false;
			return NULL;
		case 'MEDIUMINT':
			$attributes['TYPE'] = 'INTEGER';
			$attributes['UNSIGNED'] = false;
			return NULL;
		case 'INTEGER':
			$attributes['TYPE'] = 'INT';
			return NULL;
		case 'BIGINT':
			$attributes['TYPE'] = 'INT64';
			return NULL;
		default:
			return NULL;
		}
	}

	protected function _attr_unique(&$attributes, &$field)
	{
		if (!empty($attributes['UNIQUE']) && ($attributes['UNIQUE'] === true)) {
			$field['unique'] = ' UNIQUE';
			$field['null'] = ' NOT NULL';
		}
	}

	protected function _attr_auto_increment(&$attributes, &$field)
	{
		if (!empty($attributes['AUTO_INCREMENT']) && ($attributes['AUTO_INCREMENT'] === true)) {
			if (stripos($field['type'], 'int') !== false) {
				$field['auto_increment'] = ' AUTO_INCREMENT';
			}
			else if (strcasecmp($field['type'], 'UUID') === 0) {
				$field['auto_increment'] = ' AUTO_GENERATE';
			}
		}
	}
}

?>
